scala - 为什么 SemigroupK.combineK 语法不能用于 Resource[F, ?]？

Question

考虑以下简单的应用程序：

import cats.effect.Resource
import cats.{Monad, SemigroupK}
import cats.syntax.semigroupk._

object ResourceSemigroupK extends App {

  //Error: value combineK is not a member of class Resource
  def combine[F[_]: SemigroupK: Monad](rsc: Resource[F, Unit], append: Resource[F, Unit]): Resource[F, Unit] = 
    rsc.combineK(append)
  
  //Works ok
  def combineExplicitly[F[_]: SemigroupK: Monad](rsc: Resource[F, Unit], append: Resource[F, Unit]): Resource[F, Unit] =
    SemigroupK[Resource[F, ?]].combineK(rsc, append)
}

有没有办法应用combineK语法Resource[F, Unit]？